Treatment tool for use in a subterranean well

Abstract

A treatment tool can include a housing with longitudinal passages, a valve that controls flow between sections of one passage, another valve that controls flow between the one passage and a section of another passage, and a locking device that prevents the first valve from being transitioned to an open configuration from a closed configuration. A method can include flowing a fluid through a passage of a service string and into an annulus about a screen, the fluid entering the screen and flowing to another annulus via another passage of the service string, then installing a plug in the first passage, thereby preventing flow through the first passage to the annulus about the screen, and creating at least one pressure differential across the plug, thereby preventing flow from an interior of the screen to the other annulus and permitting flow from the first passage to the screen interior.

What is claimed is: 
     
       1. A method of treating a subterranean well, the method comprising:
 installing a completion assembly with a service string in the well; 
 setting a packer of the completion assembly, thereby separating a first annulus from a second annulus, the second annulus surrounding a screen of the completion assembly; 
 flowing a first fluid through a first flow passage of the service string and into the second annulus, the first fluid entering the screen and flowing to the first annulus via a second flow passage of the service string; 
 then installing a plug in the first flow passage, thereby preventing flow through the first flow passage to the second annulus; and 
 creating at least one pressure differential across the plug, thereby preventing flow from an interior of the screen to the first annulus and permitting flow from the first flow passage to the interior of the screen. 
 
     
     
       2. The method of  claim 1 , wherein the at least one pressure differential comprises first and second pressure differentials, wherein the first pressure differential causes flow to be prevented from the interior of the screen to the first annulus, and wherein the second pressure differential causes flow to be permitted from the first flow passage to the interior of the screen. 
     
     
       3. The method of  claim 1 , wherein the preventing flow from the interior of the screen to the first annulus is performed prior to the permitting flow from the first flow passage to the interior of the screen. 
     
     
       4. The method of  claim 1 , further comprising flowing a second fluid through the service string and from the first flow passage to the interior of the screen, and wherein the second fluid comprises a treatment fluid. 
     
     
       5. The method of  claim 4 , wherein the treatment fluid comprises an acid. 
     
     
       6. The method of  claim 1 , wherein the preventing flow from the interior of the screen to the first annulus comprises a locking device preventing a first valve from transitioning from a closed configuration to an open configuration. 
     
     
       7. The method of  claim 6 , wherein the locking device maintains a seal of the first valve engaged with a seal bore. 
     
     
       8. The method of  claim 7 , wherein the locking device maintains a longitudinal compression of the seal. 
     
     
       9. The method of  claim 6 , wherein the permitting flow from the first flow passage to the interior of the screen comprises opening a second valve. 
     
     
       10. The method of  claim 9 , wherein the preventing flow from the interior of the screen to the first annulus further comprises closing the first valve by displacing a mandrel relative to an outer housing, the mandrel circumscribing the first flow passage, and wherein the opening the second valve comprises displacing a sleeve relative to the mandrel. 
     
     
       11. The method of  claim 1 , further comprising securing the plug in the first flow passage, thereby restricting displacement of the plug through the first flow passage. 
     
     
       12. A system for use with a subterranean well, the system comprising:
 a completion assembly including a packer and a screen, the packer separates a first annulus from a second annulus surrounding the screen; and 
 a service string engaged with the completion assembly, the service string including a treatment tool with first and second flow passages extending longitudinally through the treatment tool, a plug in the first flow passage prevents flow through the service string from the first flow passage to the second annulus, a first valve of the treatment tool prevents flow through the second flow passage from an interior of the screen to the first annulus, a second valve of the treatment tool permits flow from the first flow passage to the interior of the screen through the second flow passage. 
 
     
     
       13. The system of  claim 12 , wherein a locking device of the treatment tool prevents the first valve from being transitioned from a closed configuration to an open configuration. 
     
     
       14. The system of  claim 13 , wherein the locking device prevents disengagement of a seal of the first valve from a seal bore. 
     
     
       15. The system of  claim 14 , wherein the locking device prevents the seal from being longitudinally decompressed. 
     
     
       16. The system of  claim 12 , wherein the locking device permits displacement of a member of the first valve in a first direction, but prevents displacement of the member of the first valve in a second direction opposite to the first direction. 
     
     
       17. The system of  claim 16 , wherein the first and second directions comprise longitudinal directions. 
     
     
       18. The system of  claim 16 , wherein the locking device permits displacement of the member of the first valve only in the first direction. 
     
     
       19. The system of  claim 12 , further comprising a mandrel that circumscribes the first flow passage, and wherein the locking device permits displacement of the mandrel in a first longitudinal direction, but prevents displacement of the mandrel in a second longitudinal direction opposite to the first longitudinal direction. 
     
     
       20. The system of  claim 19 , wherein a seal of the first valve engages a seal bore in response to displacement of the mandrel in the first longitudinal direction. 
     
     
       21. The system of  claim 20 , wherein the seal is longitudinally compressed in response to the displacement of the mandrel in the first longitudinal direction. 
     
     
       22. The system of  claim 19 , further comprising a sleeve of the second valve releasably secured to the mandrel, and wherein displacement of the sleeve relative to the mandrel in the first longitudinal direction causes the second valve to permit flow between the first flow passage and the second flow passage. 
     
     
       23. The system of  claim 22 , wherein a seat is disposed in the sleeve, and wherein a first pressure differential created across the plug engaged with the seat causes the mandrel to displace in the first longitudinal direction. 
     
     
       24. The system of  claim 23 , wherein the first pressure differential causes the first valve to prevent flow between first and second sections of the second flow passage. 
     
     
       25. The system of  claim 23 , wherein a second pressure differential across the plug causes the sleeve to displace relative to the mandrel in the first longitudinal direction. 
     
     
       26. The system of  claim 25 , wherein the second pressure differential causes the second valve to permit flow between the first flow passage and the second section of the second flow passage. 
     
     
       27. The system of  claim 12 , wherein the service string further comprises a plug retainer that secures the plug in the first flow passage.